Bayreuther Institut für Terrestrische Ökosystemforschung
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The turnover of organic N-compounds (DON) in a deciduous forest ecosystem


From 01/1998 to 12/2000

Principal Investigator: Egbert Matzner
Staff: Stephan Solinger
Grant: 0339476 C Grundlagen zur nachhaltigen Entwicklung von Ökosystemen bei veränderter Umwelt

Fluxes and concentrations of DOC and DON in a deciduous forest ecosystem were measured for two years in order to identify sinks and sources and to determine their quantity and dynamics. Sources occur in the canopy and most pronounced in the forest floor, while mineral soil acts as a sink for those compounds. In the dynamics of their production and turnover no clear seasonal tendencies could be observed. The DOC/DON ratio increases from bulk precipitation to forest floor leachate, indicating a preferential mobilization of N-poor dissolved organic matter in the forest floor compared to throughfall. The controls and mechanisms of DON mobilization as well as microbial participation in immobilization of these substances are still to be identified. Laboratoy incubations of throughfall and forest floor leachate gave no indication for microbial consumption of DON or DOC throughout three weeks. Neither could DON production be correlated to temperature, solution pH or electrical conductivity alone in any compartment. The portion of amino-N and aminosugar-N in DON amounts 40-80% but gives no further evidence for the microbial participation in DON mobilization.

List of publications of this Project

Kalbitz, K; Rupp, H; Meissner, R: N-, P- and DOC-dynamics in soil and groundwater after restoration of intensively cultivated fens in Broll, G; Merbach, W.; Pfeiffer, E.-M.: Wetlands in Central Europe: Soil organisms, soil ecological processes and trace gas emissions, Springer Verlag, 99-116 (2002) -- Details
Michalzik, B; Kalbitz, K; Park, J-H; Solinger, St; Matzner, E: Fluxes and concentrations of dissolved organic carbon and nitrogen - a synthesis for temperate forests, Biogeochemistry, 52(2), 173-205 (2001) -- Details
Stadler, B; Solinger, St; Michalzik, B: Insect herbivores and the nutrient flow from the canopy to the soil in coniferous and deciduous forests, Oecologia, 126, 104-113 (2001) -- Details
Park, J-H; Matzner, E: Carbon control on nitrogen dynamics in the forest floor of an N-enriched deciduous forest ecosystem, Water, Air and Soil Pollution, 130, 643-648 (2001) -- Details
Rupp, H; Kalbitz, K; Meißner, R: Folgewirkungen einer veränderten Landnutzung im Drömling auf den Phosphoreintrag in die Gewässer, Mitteilungen der Deutschen Bodenkundlichen Gesellschaft, 92, 190-193 (2000) -- Details
Kalbitz, K; Solinger, St; Park, J-H; Michalzik, B; Matzner, E: Controls on the dynamics of dissolved organic matter in soils: A review, Soil Science, 165/4, 277-304 (2000) -- Details
Kalbitz, K; Geyer, S; Geyer, W: A comparative characterization of dissolved organic matter by means of original aqueous samples and isolated humic substances, Chemosphere, 40, 1305-1312 (2000) -- Details
Kalbitz, K; Geyer, S; Gehre, M: Land use impacts on the isotopic signature (13C, 14C, 15N) of water-soluble fulvic acids in a German fen area, Soil Science, 165/9, 728-736 (2000) -- Details
Michel, K; Matzner, E: Release of dissolved organic carbon and nitrogen from forest floors in relation to solid phase properties, respiration and N-mineralization, Journal of Plant Nutr. Soil Sci., 162, 645-652 (1999) -- Details
Stadler, B; Michalzik, B: The impact of spruce aphids on nutrient flows in the canopy of Norway spruce, Agricultural and Forest Entomology, 1, 3-9 (1999) -- Details
Michalzik, B: Flüsse und Dynamik von gelösten organischen Stickstoffverbindungen (DON) in einem Fichtenwaldökosystem in Bayreuther Institut für Terrestrische Ökosystemforschung (BITÖK): Bayreuther Forum Ökologie, Selbstverlag, 67, 1-161 (1999) -- Details
Michalzik, B; Müller, T; Stadler, B: Aphids on Norway spruce and their effects on forest floor solution chemistry, Forest Ecology and Management, 118, 1-10 (1999) -- Details
Michalzik, B; Matzner, E: Dynamics of dissolved organic nitrogen and carbon in a Central European Norway spruce ecosystem, European Journal of Soil Science, 50, 579-590 (1999) -- Details
Stadler, B; Michalzik, B: Aphid infested Norway spruce are "hot spots" in throughfall carbon chemistry in coniferous forests, Canadian Journal of Forest Research, 28, 1717-1722 (1998) -- Details
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